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There's no visible price on these screen shots, if Office upgrades will be free, to be confirmed yet.

It appears the upgrade offer for Office will be for Windows users who purchase Office 2010 Home & Student, Home & Business 2010, Professional 2010 or University 2010 and Mac users who purchase University 2011 or Home & Student 2011 between October 19 and April 30, 2013. Windows users who buy these SKUs will have a choice of upgrading to Office 365 Home Premium (which is currently one of the new Office versions that is being beta tested) or Office 2013 SKUs that are more comparable to what's out there already.

The chart above shows some of the differences between Office 365 Home Premium and these more traditional Office 2013 releases. Office 365 Home Premium can be installed on up to five PCs and/or Macs and is licensed to a user as a one-year subscription, which will need to be renewed to continue usage. The more traditional Office 2013 SKUs can be installed on only one Windows PC with a non-transferrable license. (The Office for University and Mac Home & Student users will have the option to upgrade to Office 365 Home Premium only.)